Coupling transformer



47' TO/P/VE r July 28, 1925.

H. J. BLAKESLEE C OUPLI NG TRANSFORMER Filed May 25, 1924 UNIT STATES PATENT OFFICE.

HENRY J. BLAKESLEE, OF WEST HARTFORD, CONNECTICUT.

COUPLING TRANSFORMER.

Application filed May 23, 1924. Serial No. 715,293.

To ((ZZ "20. 20972 it may concern.

Be it known that I, HENRY J. BLAKESLEE,

a citizen of the United States, residin lV est Hartford, in the county of Hartford and State Tlransformers, i specification.

of Connecticut, have invented a new and useful Improvement in Coupling of which the following 1s a This invention relates to coupling transformers designed for radio work, more particularly amplifying transformers of the shell type adapted for amateur use.

The object of the invention is the production of very simple independent elements which can be very low user in any primary manufactured and sold at a price and can be put together by and secondary ratio desired, the elements being so shaped that it is impossible to assemble them in any but the s ay, same direction.

in the accompanying drawings Fig.

shows a plan of an insulating spool which the wire is wound.

that is, with the windings in the upon Fig. 2 shows a plan of the spool with the wire coiled there on. Fig. element. soft iron through the wound spools.

3 shows an edge view of the wound Fig. 4 shows ,a face view of the core pieces which are thrust Fig. 5 shows a view of one side of the assembled core and coils.

assembled transformer elements. Fig.

Fig. 6 shows an edge view of the shows a view of the other side of the transformer elements.

Fig. 8 shows a side elevation of the elements as they may be en cased in a shell.

Fig. 9 shows an edge view with the elements encased in a shell. Fig. 10 shows a top view of the encased elements.

Fig. 11 shows a plan of a piece of sheet sulation that may be used to reinforce and protect an element.

In carrying out this invention identical elements,

each comprising an insulating spool l which is wound with the desired number of turns of fine wire 2, are made in quantities and sold as desired.

of the windings are provided with The ends terminals 3 adapted to be connected together or with primary binding ing posts 5 as the case may be. insulating around the posts 4 or secondary bind- Thin sheet pieces 6 are desirably bent spools for protection and to provide means for the ready joining of the ends of the windings to the terminal wires. The

insulating spools have openings 7 for ceiving the laminated iron core pieces 8, and perforations 9 for the bolts 10 .by which they are bound together. The bolt holes through the spools are, as illustrated, located off center with relation .to the core holes in such positions that the elements cannot be put t0- gether wrong, that is, they must be assembled with the windings running in the same direction ,or the holding bolts cannot be passed through them. This is so whether the terminals project on one side or on the other side. After these elements are fast ened together the core pieces are thrust through the openings in the spools. Each core piece has three legs one in the center and one each side, joined together at one end only. One core piece is put through the elements in one direction and the next in the opposite direction so that the closed ends of the core pieces will alternate on the opposite ends of the assembled units. The core pieces may be bolted together by screw bolts 11.

Identical elements suitable for both pri mary and secondary windings are produced in quantities and they are assembled preferably with the primary winding ends on one side and the secondary winding ends on the other side. The drawings illustrate a two to six ratio transformer, that is, one with two coils connected in series and joined with the primary binding posts and six coils connected in series and joined to the secondary binding posts. It is possible as a result of this invention for a user to purchase the required number of coils and core pieces and assemble them himself in any desired ratio and with the winding ends in convenient position to be easily connected with the proper binding posts. As the windings are identical and as the means for fastening together the elements are arranged it is impossible for the user to assemble the parts incorrectly. The windings must always be in the The invention claimed is 1. A transformer which comprises a plurality of insulating spools having similar windings and means for registering one spool with the other with the windings in the same direction, means co-operating with said registering means for fastening the i spools together flatwise with the windings in the same direction, said fastening means being capable of application only when the spools are assembled flatwise with the windings in the same direction, and core pieces adapted to. be thrust through the wound spools.

2. A transformer which comprises a plurality of insulating spools having similar windings, and means for registering one spool with the other when the spools are placed face to face with the windings in the same direction, means for fastening the spools when registered with the windings in the same direction, saidfastening means being capable of application only when the spools are assembled face to face with the windings in the same direction, and a laminated corecomprising pieces thrust through the wound spools alternately in opposite directions. v I

3. A transformer element for radio use comprising an insulating spool having a core opening and fastening perforations, and a winding of fine wire upon the spool, said fastening perforation being located 0b liquely with relation to the axis of the core opening'so' that a plurality of elements can be fastened together only when the windings are in the same direction.

4. A transformer element for radio use which comprises a spool of insulating material, a winding of fine wire upon said spool and sheet insulation bent about a port-ion of said wound spool adjacent to the ends of the winding.

5. A transformer for radio work which comprises a plurality of independent coils assembled face to face with the windings of all running in the same direction, and arranged with the terminals of some of said coils extending on one side and the terminals of other of said coils extending on the other side of the assembled elements, means for fastening the coils together face to face, and core pieces shaped to be thrust through the coils from opposite directions.

6. A. transformer comprising a plurality of insulating spools provided with similar windings and having means for registering one spool with the other with the windings in the same direction, means for fastening the spools together fiatwise as registered with the windings in the same direction, and core piecesthrust through the wound spools. 7. A transformer comprising a plurality of insulating'spools'provided with similar windings, a laminated corethrust through thewound spools and means arranged obliquely to the plane of the core for fastening the spools together fiatwise with the windings in the same direction, said means thus arranged being capable of application only when the spools are assembled with the windings in the same direction.

HENRY J. BLAKESLEE. 

